Good idea about SMB, I tested it and it works. Even better, I found out that FTP now can also be used to access exported maps. So it's even possible to directly embed them in web page. It's not ideal, because password is sent in plaintext and even read-only user can access almost everything else on disk, but sometimes it might be useable.
Hopefully in the future, MikroTik will add optional symlink to make Dude's files directory accessible also using RouterOS web server. Moving exported maps to dedicated subdirectory and making only that accessible would not hurt either.
People who quote full posts should be spanked with ethernet cable. Some exceptions for multi-topic threads may apply.